Windows/Mac/Linux: If you spend your entire day staring into the pit of an eye-burning LCD, free application F.lux may be right up your alley.

This free utility adjusts the glow of your monitor—both the brightness and tint—based on the time of day, dimming your monitor later into the evening and tinting the screen color based on the kind of lighting you employ. To get a better idea of what those changes will look like over the course of the day, F.lux has a preview option that runs through the dimming in a few seconds. The dimming and tinting seems drastic in the preview, but I'm giving this one a test run in real time to see how it really feels.

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Obviously this app wouldn't work well for a designer or someone who relies on accurate screen color (though you could use the Disable for one hour option), but as someone has lost more than a few battles with insomnia, I do appreciate the idea that coming to the computer at 3am won't burn my retinas. If you give it a try or have used it in the past, let's hear how it works for you in the comments.